Difference between revisions of "Thursday, May 21, 2015, 11:00am EDT - Compton"
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=== General === | === General === | ||
| − | * Update on test at 2 pass (Gaskell) | + | * Update on test at 2 pass (Gaskell) [https://hallaweb.jlab.org/wiki/images/e/e0/Halla_compton_commisioning.pdf pdf] |
=== DAQ === | === DAQ === | ||
| Line 23: | Line 23: | ||
=== Electron detector === | === Electron detector === | ||
* Updates from Alexandre - did we learn anything from the little bit of beam we took? | * Updates from Alexandre - did we learn anything from the little bit of beam we took? | ||
| + | **Cannot get closer than 22 mm | ||
| + | **Run 1370 : 1857 triple coincidence ABD, 1634 no hit plane C, 223 hits plane C at thresold 21 : 12 % efficiency though cannot conclude since it could be photons and corellated noise | ||
| + | **https://hallaweb.jlab.org/dvcslog/compton/366 | ||
* Updates from Manitoba | * Updates from Manitoba | ||
| Line 33: | Line 36: | ||
* Primary goal is implementing polarization setting and monitoring a la Hall C. | * Primary goal is implementing polarization setting and monitoring a la Hall C. | ||
** Work plan: [https://hallaweb.jlab.org/dvcslog/compton/365 Compton elog 365] | ** Work plan: [https://hallaweb.jlab.org/dvcslog/compton/365 Compton elog 365] | ||
| − | ** Controls modifications request: [https://hallaweb.jlab.org/wiki/ | + | ** Controls modifications request: [https://hallaweb.jlab.org/wiki/images/0/00/Laser-table-controls.pdf pdf] |
* Other tasks: Gather spares, get laser lab fully functional | * Other tasks: Gather spares, get laser lab fully functional | ||
== Minutes == | == Minutes == | ||
| + | * Dave should get the Bluejeans stuff working properly - this will make life easier for future meetings. | ||
| + | * Dave went over 2 pass commissioning stuff - a lot of things went well! | ||
| + | * Electron detector commissioning trickier - at "22 mm" from beam , Alex starting seeing more rate in photon detector, ion chambers tripped. Info from BPM between dipoles 3-4 suggests beam might have been at larger y than expected. | ||
| + | ** 2 example spectra shown - not clear if we're seeing "real" signal or not. Might be coming from photons. No clear Compton events. | ||
| + | ** Plans for summer include removing detector to inspect, get DAQ working better. Try with QWADs? | ||
| + | * Manitoba making progress on electron detector - but it takes time getting all the parts, connectors etc. Mitra has some questions about QWADs - will talk to Dipangkar offline. | ||
| + | * Photon Detector | ||
| + | ** Gregg notes that working on the Analyzer is a plan for the summer. Also thinks we might need something for simple online monitoring since old DAQ is going away. | ||
| + | ** Detector work (Brian): Add temperature monitoring to detector. Would like to do more linearity measurements at CMU - Dave will check on whether the old loan agreement is still in force. | ||
| + | * Alexandre will submit proposal to EIC R&D - focus on vacuum chamber adapter that would allow putting Hall C detector in Hall A and vice versa (?). | ||
| + | * Dave notes that Elke Aschenauer suggested a meeting of BNL and JLab polarimetry experts to discuss strategy at an EIC. | ||
Latest revision as of 12:27, 21 May 2015
*********BLUEJEANS CALL-IN INSTRUCTIONS********* ---------------------------------------------------- 1. Dial Toll-Free Number: 1-888-240-2560 (U.S. & Canada) 2. International participants dial: Toll Number: 1-408-740-7256 3. Enter meeting ID:140287970
Agenda
Meeting room=F227 in Cebaf Center
General
- Update on test at 2 pass (Gaskell) pdf
DAQ
- Lots of DAQ work planned for this summer (Bob - if available)
- Remove old Saclay counting DAQ
- Put in new photon counting DAQ
- How will this impact electron detector?
- VETROC tests
Electron detector
- Updates from Alexandre - did we learn anything from the little bit of beam we took?
- Cannot get closer than 22 mm
- Run 1370 : 1857 triple coincidence ABD, 1634 no hit plane C, 223 hits plane C at thresold 21 : 12 % efficiency though cannot conclude since it could be photons and corellated noise
- https://hallaweb.jlab.org/dvcslog/compton/366
- Updates from Manitoba
Photon Detector
- Analyzer - would be nice if we could get background subtracted asymmetries from 2 pass data.
- Bob has put the analyzer on GitHub: https://github.com/rwmichaels/compton
- Plans for upgrades or improvements this summer?
Laser
- Primary goal is implementing polarization setting and monitoring a la Hall C.
- Work plan: Compton elog 365
- Controls modifications request: pdf
- Other tasks: Gather spares, get laser lab fully functional
Minutes
- Dave should get the Bluejeans stuff working properly - this will make life easier for future meetings.
- Dave went over 2 pass commissioning stuff - a lot of things went well!
- Electron detector commissioning trickier - at "22 mm" from beam , Alex starting seeing more rate in photon detector, ion chambers tripped. Info from BPM between dipoles 3-4 suggests beam might have been at larger y than expected.
- 2 example spectra shown - not clear if we're seeing "real" signal or not. Might be coming from photons. No clear Compton events.
- Plans for summer include removing detector to inspect, get DAQ working better. Try with QWADs?
- Manitoba making progress on electron detector - but it takes time getting all the parts, connectors etc. Mitra has some questions about QWADs - will talk to Dipangkar offline.
- Photon Detector
- Gregg notes that working on the Analyzer is a plan for the summer. Also thinks we might need something for simple online monitoring since old DAQ is going away.
- Detector work (Brian): Add temperature monitoring to detector. Would like to do more linearity measurements at CMU - Dave will check on whether the old loan agreement is still in force.
- Alexandre will submit proposal to EIC R&D - focus on vacuum chamber adapter that would allow putting Hall C detector in Hall A and vice versa (?).
- Dave notes that Elke Aschenauer suggested a meeting of BNL and JLab polarimetry experts to discuss strategy at an EIC.
